README
======

This repository contains lunar polar maps for volatile stability based on LRO
Diviner temperature measurements. 

Context and methodology are described in Schorghofer & Williams (2020) 
https://doi.org/10.3847/PSJ/abb6ff and in an upcoming publication by 
Schorghofer, Williams, and Mazarico (2024).

Maps are provided in netCDF (GMT) .grd format. All maps are in polar 
stereographic projection with 240m/pixel true at the pole.


Directories
-----------

polar_north_96x2/polar_north_80_*.*
    Maps of lunar polar region north of 80N based on 96 diurnal and 2 seasonal bins.
    Based on Diviner data from Jul 2009 to Feb 2019.
    
polar_north_96x2_2024/polar_north_80_*.*
    Maps of lunar polar region north of 80N based on 96 diurnal and 2 seasonal bins.
    Based on Diviner data from Jul 2009 to Jan 2024.

polar_south_24x6/polar_south_80_*.*
    Maps of lunar polar region south of 80S based on 24 diurnal and 6 seasonal bins.
    Based on Diviner data from Jul 2009 to Mar 2020.
    
polar_south_96x2/polar_south_80_*.*
    Maps of lunar polar region south of 80S based on 96 diurnal and 2 seasonal bins.
    Based on Diviner data from Jul 2009 to Feb 2019.
        
Utilities/
    Shell scripts that plot maps with Generic Mapping Tools (GMT)


Files
-----

polar_*_cc.grd:
    Number of bins (out of 96x2=192 or 24x6=144, respectively) populated with Diviner data

polar_*_Emax.grd:
    Maximum (over Draconic Year) of potential sublimation rate [kg/m^2/Ga]

polar_*_Emean.grd:
    Mean potential sublimation rate, averaged over ecliptic and subsolar longitudes [kg/m^2/Ga]

polar_*_pump.grd:
    Pumping differential [m/Ga]; negative values are set to NaN

polar_*_Tmax.grd:
    Maximum temperature, after frequency-domain Fourier-filtering [K]

polar_*_Tmean.grd:
    Mean temperature, averaged over ecliptic and subsolar longitudes [K]

polar_*_zit-1.grd:
    Depth to sublimation loss rate of 1 kg/m^2/Ga [m]

polar_*_zit-100.grd:
    Depth to sublimation loss rate of 100 kg/m^2/Ga [m]

polar_*_unsmoothed.grd:
    Frequency-domain Fourier-filtering of temperature time series was only 
    applied to interpolated data but not to measured data.

*/coldtrapareas_*.dat
    Tables with cold trap areas; plain text data
    
